JP6118304B2 - Communication system and communication apparatus - Google Patents

Description

  The present invention superimposes a differential signal on the control signal using a control line for transmitting a control signal for controlling battery charging of the vehicle and a reference potential line connected to a reference potential of the vehicle. The present invention relates to a communication system that communicates with an external power supply apparatus. The present invention also relates to a communication device constituting the communication system.

  Plug-in hybrid electric vehicles (PHEV) using both an electric motor and an engine, and electric vehicles (EV: Electric Vehicle) that are not equipped with an engine and are driven by an electric motor are becoming widespread. Vehicles such as plug-in hybrid vehicles and electric vehicles include a battery that drives an electric motor, and charging of the battery is performed using a power supply device installed in an external power supply station, a general house, or the like.

FIG. 10 is a block diagram illustrating a configuration of a vehicle connected to the power supply apparatus. The power feeding device 2 includes a charging cable 3 provided with a charging gun for connection to the vehicle 1001 at the tip. The vehicle 1001 is provided with a connector 11 to which a charging gun is connected, and the user can connect the power supply device 2 to the vehicle 1001 by connecting the charging gun to the connector 11. The charging cable 3 includes two power supply lines 1001a and 1001b, a reference potential line 1001c, a control line 1001d, and a connection detection line (not shown) for detecting connection of a charging gun. Feed lines 1001 a and 1001 b are connected to a charging device 12 mounted on the vehicle 1001. The reference potential line 1001c is connected to the reference potential via the charging device 12. The reference potential is, for example, the body ground of the vehicle 1001. The power supply device 2 supplies alternating current to the charging device 12 via the power supply lines 1001 a and 1001 b, and the charging device 12 converts the supplied alternating current into direct current to charge the battery 10. A CP receiving circuit 1013 is connected to the control line 1001d via the PLC communication device 1014. The CP receiving circuit 1013 is a circuit that receives a pilot signal transmitted from the power supply apparatus 2, and the power supply apparatus 2 performs charge control by transmitting and receiving a control pilot signal (for example, Non-Patent Document 1). The control pilot signal is a rectangular wave signal, and the power feeding device 2 transmits and receives information related to charging, such as whether charging is possible and a charging state, depending on the potential of the rectangular wave signal with respect to the reference potential, the presence / absence of the rectangular wave signal, and the like.
A PLC communication device 1014 connected to each of the control line 1001d and the reference potential line 1001c is mounted on the vehicle 1001. The PLC communication device 1014 is connected to a lead battery 10 a, and the lead battery 10 a is also connected to the reference potential of the vehicle 1001. The PLC communication device 1014 superimposes a differential signal having a frequency higher than that of the control pilot signal, for example, a differential signal of 2 to 30 MHz on the control pilot signal, and separates the differential signal superimposed on the pilot signal, thereby Communication using differential signals. The power feeding device 2 can perform higher-level information communication than the pilot signal by transmitting and receiving differential signals to and from the PLC communication device 1014.

"SURFACE VEHICLE RECOMMENDED PRACTICE", J1772 FEB2012, Society of Automotive Engineers, Inc., October 1996 (revised in February 2012)

As described above, the PLC communication device 1014 transmits and receives differential signals using the control line 1001d and the reference potential line 1001c. The control line 1001d is connected to the PLC communication device 1014 having a predetermined impedance, while the reference potential line 1001c is connected to a body ground having a low impedance. The negative electrode of the lead battery 10a connected to the PLC communication device 1014 is also connected to the body ground. Therefore, the PLC communication device 1014 has a low balance. Therefore, the common mode noise generated in the control line 1001d and the reference potential line 1001c through the body ground is converted into differential mode noise and input to the PLC communication device 1014 as shown in FIG. . Since the PLC communication device 1014 performs communication using a differential signal of 2 to 30 MHz, noise in the differential mode of 2 to 30 MHz cannot be separated and removed, and the PLC communication device 1014 malfunctions. was there.
Although a method of preventing malfunction of the PLC communication device 1014 by providing a common mode choke coil in the control line 1001d and the reference potential line 1001c can be considered, noise generated in the control line 1001d and the reference potential line 1001c is effectively prevented. May not be removed. It is considered that a part of the common mode noise generated in the control line 1001d and the reference potential line 1001c is converted into differential mode noise without being removed by the common mode choke coil and input to the PLC communication device 1014.

  The present invention has been made in view of such circumstances, and its purpose is to reduce noise input to the PLC communication device by converting from the common mode to the differential mode, and to prevent malfunction of the PLC communication device. It is to provide a communication system capable of Moreover, it aims at providing the communication apparatus which comprises the said communication system.

  A communication system according to an aspect of the present invention is connected to a control line that transmits a control signal for controlling charging of a battery mounted on a vehicle, and a reference potential of the vehicle that serves as a reference for the control signal. A reference potential line, a communication device connected to the control line and the reference potential line, respectively, and a communication device that communicates with an external power feeding device by superimposing a differential signal having a higher frequency than the control signal on the control signal; A first inductive element that is provided in the reference potential line and a connection portion of the reference potential, or in the middle of the reference potential line, and that has a higher impedance to noise at a frequency higher than that of the control signal; A wiring for connecting the communication device to another battery, a connection point of the wiring and the other battery, or provided in the middle of the wiring, And a second inductive element greater than the impedance to the impedance against high-frequency noise than control signals the control signal.

  A communication apparatus according to an aspect of the present invention is connected to a control line that transmits a control signal for controlling charging of a battery mounted on a vehicle, and a reference potential of the vehicle that serves as a reference for the control signal. A communication device that is connected to a reference potential line and communicates with an external power supply device by superimposing a differential signal having a frequency higher than that of the control signal on the control signal, and the communication device is connected to another battery. Wiring for connecting to the wiring, and the connecting portion of the wiring and the other battery, or in the middle of the wiring, and the induction having a higher impedance to noise at a higher frequency than the control signal is larger than the impedance to the control signal An element.

  According to the above, it is possible to provide a communication system and a communication device that are converted from the common mode to the differential mode, reduce noise input to the communication device, and prevent malfunction of the communication device.

1 is a circuit block diagram illustrating a configuration example of a communication system according to a first embodiment. It is a graph which shows the relationship between balance degree attenuation amount and radiation noise. 6 is a circuit block diagram illustrating a configuration example of a communication system according to a second embodiment. FIG. FIG. 6 is a circuit block diagram illustrating a configuration example of a communication system according to a third embodiment. 6 is a schematic diagram illustrating a configuration of a connector according to Embodiment 3. FIG. FIG. 6 is a circuit block diagram illustrating a configuration example of a communication system according to a fourth embodiment. FIG. 10 is a circuit block diagram illustrating a configuration example of a communication system according to a fifth embodiment. FIG. 10 is a circuit block diagram illustrating a configuration example of a communication system according to a sixth embodiment. FIG. 10 is a circuit block diagram illustrating a configuration example of a communication system according to a seventh embodiment. It is a block diagram which shows the structure of the vehicle connected to the electric power feeder.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.

(1) A communication system according to an aspect of the present invention includes a control line that transmits a control signal for controlling charging of a battery mounted on a vehicle, and a reference potential of the vehicle that serves as a reference for the control signal. A reference potential line to be connected, and a communication that is connected to the control line and the reference potential line, and communicates with an external power supply device by superimposing a differential signal having a frequency higher than that of the control signal on the control signal. The device is provided in the middle of the reference potential line and the reference potential line, or in the middle of the reference potential line, and has a first impedance greater than that for the control signal. Inductive element, wiring for connecting the communication device to another battery, and the connection point of the wiring and the other battery, or provided in the middle of the wiring Impedance to high frequency noise than said control signal and a second inductive element greater than the impedance for the control signal.

  A first inductive element is provided at the connection point of the reference potential line and the reference potential or in the middle of the reference potential line. In addition, a second inductive element is provided in the wiring for connecting the communication device to another battery and the connection location of the other battery, or in the middle of the wiring. The inductive element has an impedance with respect to high-frequency noise higher than that of the control signal. Therefore, with respect to the noise, the degree of balance of the communication device connected to the control line and the reference potential line is higher than that of the device that does not include the first and second induction elements. Therefore, it is possible to suppress the common mode noise generated in the control line and the reference potential line from being converted into the differential mode noise, and to prevent malfunction of the communication device due to the differential mode noise.

(2) It is preferable that the communication device includes a circuit board that holds the second inductive element and a resin cover that covers the circuit board that holds the second inductive element.

  The second inductive element is held on the circuit board and covered with a resin cover. Therefore, it is possible to more effectively prevent the second inductive element from coming into contact with the internal structure of the vehicle and being damaged by the vibration or vibration of the vehicle.

(3) The communication device includes a filter that separates the differential signal from the control signal, and a coupling transformer connected to the filter, and the cover covers the filter and the coupling transformer. A certain structure is preferable.

  The second inductive element, filter, and coupling core held on the circuit board are covered with a cover. Therefore, it is possible to more effectively prevent each electronic component from coming into contact with the internal structure of the vehicle and being damaged by the vibration or vibration of the vehicle.

(4) A configuration including a receiving circuit that is connected to the control line and receives a control signal transmitted from an external power supply apparatus is preferable.

(5) A configuration including a third inductive element that is provided in the middle of the wiring that connects the receiving circuit to the reference potential, and that has a higher impedance to noise at a frequency higher than that of the control signal. preferable.

  A third inductive element is provided in the middle of the wiring connecting the receiving circuit to the reference potential. The third inductive element has an impedance with respect to high frequency noise higher than that of the control signal. Therefore, with regard to the noise, the degree of balance of the communication device connected to the control line and the reference potential line is higher than that of the device not including the third inductive element. Therefore, it is possible to suppress the common mode noise generated in the control line and the reference potential line from being converted into the differential mode noise, and to more effectively prevent the malfunction of the communication apparatus due to the differential mode noise.

(6) A communication device according to an aspect of the present invention includes a control line that transmits a control signal for controlling charging of a battery mounted on a vehicle, and a reference potential of the vehicle that serves as a reference for the control signal. A communication device that is connected to a reference potential line to be connected, and communicates with an external power supply device by superimposing a differential signal having a frequency higher than that of the control signal on the control signal, the communication device comprising: Wiring for connecting to another battery, and a connection point of the wiring and the other battery, or in the middle of the wiring, and impedance for high-frequency noise is higher than impedance for the control signal. And a large inductive element.

An inductive element is provided in a wiring for connecting the communication device to another battery and a connection location of the other battery, or in the middle of the wiring. The inductive element has an impedance with respect to high-frequency noise higher than that of the control signal. Therefore, regarding the noise, the degree of balance of the communication device connected to the control line and the reference potential line is higher than that of the device not including the inductive element. Therefore, it is possible to suppress the common mode noise generated in the control line and the reference potential line from being converted into the differential mode noise, and to prevent malfunction of the communication device due to the differential mode noise.
The inductive element is arranged inside the communication device. Therefore, it is possible to prevent the inductive element from coming into contact with the internal structure of the vehicle and damaging due to the shake or vibration of the vehicle.

[Details of the embodiment of the present invention]
Specific examples of a communication system and a connector according to an embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included. Moreover, you may combine arbitrarily at least one part of embodiment described below.
(Embodiment 1)
FIG. 1 is a circuit block diagram illustrating a configuration example of a communication system according to the first embodiment.
The communication system according to the first embodiment includes a vehicle 1 such as a plug-in hybrid vehicle or an electric vehicle, and a power supply device 2 that supplies power to a battery 10 of the vehicle 1 via a charging cable 3.

One end of the charging cable 3 is connected to the power supply device 2, and a charging gun 30 is provided at the other end of the charging cable 3. The charging cable 3 includes two power supply lines 3a and 3b, a reference potential line 3c, a control line 3d, and a connection detection line (not shown) for detecting that the charging gun 30 is connected to the vehicle 1. The feeders 3a and 3b are conducting wires to which an alternating voltage output from the feeder 2 is applied. The control line 3d is a conductor for transmitting a control pilot signal (control signal) for controlling charging of the battery 10 mounted on the vehicle 1. The reference potential line 3c is a conducting wire connected to the reference potential of the vehicle 1, for example, body ground, which serves as a reference for the control pilot signal. As will be described later, the control line 3d and the reference potential line 3c also function as a differential signal transmission medium.
The charging gun 30 includes a gun grip-type gripping part, a plug, an insertion guide for connecting to the connector 11 of the vehicle 1, a latch for locking with the vehicle 1, and the like. The plug of the charging gun 30 has a shape that can be connected to the connector 11 of the vehicle 1. The plug includes an AC supply terminal that outputs an alternating current supplied from the power supply device 2, and a common potential terminal for connection to a reference potential. A control pilot signal terminal for inputting / outputting a control pilot signal, a connection detection terminal, and the like are provided.

  The power feeding device 2 includes a power supply device 20, a second charge control device 23, and a second PLC communication device 24. The power supply device 20 is connected to one end portions of the power supply lines 3a and 3b and the reference potential line 3c. The power supply device 20 supplies alternating current to the vehicle 1 through the power supply lines 3a and 3b. The operation of the power supply device 20 is controlled by the second charge control device 23.

The second charging control device 23 includes a CP transmission circuit 23a and a microcomputer (not shown). A control line 3d is connected to the CP transmission circuit 23a, and the CP transmission circuit 23a transmits and receives a control pilot signal for controlling charging of the battery 10 mounted on the vehicle 1. The control pilot signal is, for example, a 1 kHz rectangular wave signal, and the second charging control device 23 confirms the connection between the power feeding device 2 and the vehicle 1 and charges depending on the potential of the rectangular wave signal with respect to the reference potential, the presence or absence of the rectangular wave signal, and the like. Information related to charging, such as whether or not it is possible, and the state of charge.
Specifically, the CP transmission circuit 23a includes a capacitor C2, a resistor R2, and an oscillation circuit O that outputs a rectangular wave signal. One terminal of the transmission circuit O is connected to a reference potential, and one end of a resistor R2 is connected to the other terminal. The other end of the resistor R2 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to a reference potential. One end of the control line 3d is connected to the other end of the resistor R2. The microcomputer of the second charge control device 23 controls the operation of the transmission circuit O to transmit a control pilot signal. The second charge control device 23 has a voltage detection circuit that detects the voltage of the control pilot signal applied to the control line 3d, and the microcomputer outputs the voltage from the vehicle 1 using the voltage detection circuit. The obtained information is acquired, and the operation of the power supply device 20 is controlled.

The second PLC communication device 24 is connected to the control line 3d and the reference potential line 3c, and transmits and receives information related to charging to and from the vehicle 1 using the control line 3d and the reference potential line 3c. The second PLC communication device 24 communicates with the vehicle 1 by superimposing a differential signal having a frequency higher than that of the control pilot signal, for example, a differential signal of 2 to 30 MHz, on the control pilot signal.
Specifically, the second PLC communication device 24 includes a coupling capacitor 27 and a coupling transformer 26 that separate a differential signal superimposed on the control pilot signal from the control pilot signal, and a communication circuit that transmits and receives the differential signal. 25.
Two branch lines branched from the control line 3d and the reference potential line 3c are connected to the coupling transformer 26 via the coupling capacitor 27. The coupling capacitor 27 has a high impedance for the control pilot signal and a low impedance for the differential signal. As the coupling capacitor 27, for example, a capacitor having a capacitance of 1 nF is used.
The coupling transformer 26 has a primary coil 26a and a secondary coil 26b magnetically coupled to the primary coil 26a. The two branch lines are connected to both ends of the primary coil 26 a via a coupling capacitor 27. Both ends of the secondary coil 26 b are connected to the communication circuit 25. The communication circuit 25 has a band-pass filter that cuts off a signal outside the frequency band of the differential signal, and receives the differential signal separated by the coupling capacitor 27 and the coupling transformer 26 and passed through the band-pass filter. To do. The communication circuit 25 transmits a differential signal by giving a signal to be transmitted to the secondary coil 26b.

  The vehicle 1 includes a battery 10, a lead battery (other battery) 10a, a connector 11, a charging device 12, a first charging control device 13, a first PLC communication device (communication device) 14, and an induction element 18a.

  The connector 11 is provided at an appropriate location of the vehicle 1 as a power feeding port, and the vehicle 1 is connected to the power feeding device 2 via the charging cable 3 by connecting the plug of the charging gun 30 to the connector 11. The connector 11 has a connection portion connected to each connection terminal of the plug, and each connection portion includes one end portions of the feeder lines 1a and 1b, the reference potential line 1c, and the control line 1d as internal wiring. It is connected. That is, by connecting the plug of the charging gun 30 to the connector 11, the connecting terminal of the plug is electrically connected to the connecting portion of the connector 11, and the power supply lines 3 a and 3 b, the reference potential line 3 c and the control line of the charging cable 3 are connected. 3d is connected to power supply lines 1a and 1b, a reference potential line 1c, and a control line 1d inside the vehicle 1.

  The charging device 12 is connected to the other end portions of the feeder lines 1a and 1b and the reference potential line 1c. The charging device 12 is a device that converts the alternating current supplied from the power supply device 2 via the power supply lines 1 a, 1 b, 3 a, 3 b to direct current and charges the battery 10. The operation of the charging device 12 is controlled by the first charging control device 13. A reference potential line 1 c arranged in the vehicle 1 is connected to the reference potential via the charging device 12. The reference potential is, for example, body ground.

The induction element 18a is provided in the middle of the reference potential line 1c. Specifically, it is provided closer to the charging device 12 than a portion where a branch line branches from the reference potential line 1 c to the first PLC communication device 14. The impedance of the inductive element 18 with respect to high frequency noise is larger than the impedance of the inductive element 18 with respect to the control pilot signal. The high frequency means higher than the frequency of the control pilot signal. The inductive element 18a is, for example, a choke coil interposed in the reference potential line 1c. The capacity of the induction element 18a is, for example, 50 μH.
Note that the above-described position where the inductive element 18a is provided is an example, and the inductive element 18a may be provided in a wiring connecting the charging device 12 and the reference potential. Further, the inductive element 18 a may be provided in the middle of the reference potential line 1 c arranged inside the charging device 12.

The first charging control device 13 includes a CP receiving circuit (receiving circuit) 13a and a microcomputer (not shown). The CP receiving circuit 13a is connected to the other end of the control line 1d via the first PLC communication device 14, and the CP receiving circuit 13a is a control pilot for controlling the charging of the battery 10 mounted on the vehicle 1. Send and receive signals. The first charging control device 13 transmits and receives information related to charging, such as the connection confirmation of the power supply device 2 and the vehicle 1, whether or not charging is possible, and the charging state depending on the potential of the rectangular wave signal with respect to the reference potential, the presence or absence of the rectangular wave signal, and the like.
Specifically, the CP receiving circuit 13a includes a capacitor C1, a resistor R1, and a diode Vd. The other end of the control line 1d is connected to the anode of the diode Vd and one end of the capacitor C1, and the other end of the capacitor C1 is connected to a reference potential. The cathode of the diode Vd is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to a reference potential. The resistor R1 is, for example, a variable resistor, and the microcomputer of the first charging control device 13 controls the potential of the control pilot signal by changing the resistance value of the resistor R1, and transmits information related to charging control to the power feeding device 2. . The first charging control device 13 has a voltage detection circuit that detects the voltage of the control pilot signal applied to the control line 1d, and the microcomputer outputs the voltage from the vehicle 1 using the voltage detection circuit. The obtained information is acquired and the operation of the charging device 12 is controlled.

The first PLC communication device 14 is connected to the control line 1d and the reference potential line 1c, and uses the control lines 1d and 3d and the reference potential lines 1c and 3c to transmit and receive information on charging to and from the power feeding device 2. To do. The first PLC communication device 14 communicates with the vehicle 1 by superimposing a differential signal having a frequency higher than that of the control pilot signal on the control pilot signal.
Specifically, the first PLC communication device 14 transmits and receives the differential signal to and from the coupling capacitor (filter) 17 and the coupling transformer 16 that separate the differential signal superimposed on the control pilot signal from the control pilot signal. And a communication circuit 15 for performing the operation.
Two branch lines branched from the control line 1 d and the reference potential line 1 c are connected to the coupling transformer 16 via the coupling capacitor 17. The coupling capacitor 17 has a high impedance for the control pilot signal and a low impedance for the differential signal.
The coupling transformer 16 includes a primary coil 16a and a secondary coil 16b magnetically coupled to the primary coil 16a. The two branch lines are connected to both ends of the primary coil 16 a via a coupling capacitor 17. Both ends of the secondary coil 16 b are connected to the communication circuit 15. The communication circuit 15 has a band-pass filter that cuts off a signal outside the frequency band of the differential signal, and receives the differential signal separated by the coupling capacitor 17 and the coupling transformer 16 and passed through the band-pass filter. To do. The communication circuit 15 transmits a differential signal by giving a signal to be transmitted to the secondary coil 16b.

The power supply circuit 15a that supplies power to the communication circuit 15 is connected to the lead battery 10a via the wiring 14b. Among the two wirings 14b, the ground-side wiring 14b is connected to the reference potential. A second inductive element 18b is interposed in the middle of each of the two wires 14b. The inductive element 18b is an element that has an impedance with respect to high-frequency noise higher than that of the control pilot signal than that with respect to the control pilot signal. The inductive element 18b is, for example, a choke coil interposed in the wiring 14b.
The coupling capacitor 17, the coupling transformer 16, and the second induction element 18b are arranged on the circuit board 14a. The coupling capacitor 17, the coupling transformer 16, and the second inductive element 18b held on the circuit board 14a are covered with a resin cover 14c.
In addition, although the example which distribute | arranges the 2nd induction | guidance | derivation element 18b inside the 1st PLC communication apparatus 14 was demonstrated in FIG. 1, a 2nd induction | guidance | derivation element is in the middle of the wiring 14b routed outside the 1st PLC communication apparatus 14. 18b may be provided. In addition, a second inductive element 18b may be provided at a connection location of the wiring 14b and the lead battery 10a.

  According to the communication system configured as described above, the first and second PLC communication devices are provided for noise in the same frequency band as that of the differential signal by providing the inductive elements 18a and 18b in the middle of the reference potential line 1c and the wiring 14b. The degree of balance of 14 and 24 is higher than that of a device not including the induction elements 18a and 18b. Therefore, it is possible to suppress the common mode noise generated in the control lines 1d and 3d and the reference potential lines 1c and 3c from being converted into differential mode noise. Therefore, the noise that is converted from the common mode to the differential mode and input to the first PLC communication device 14 can be reduced, and the malfunction of the first PLC communication device 14 can be prevented.

Moreover, radiation noise can be reduced.
FIG. 2 is a graph showing the relationship between the balance attenuation and the radiation noise. The horizontal axis represents the balance degree attenuation amount (LCL: longitudinal conversion loss) of the first and second PLC communication devices 14 and 24, and the vertical axis represents the actual measurement value of the radiation noise. The rhombus plot graph represents the radiation noise when the charging gun 30 is removed. The graph of the triangular plot is radiation noise when the charging gun 30 is inserted. As is clear from the actual measurement value of the radiation noise shown in the graph of FIG. 2, the higher the degree of balance between the first and second PLC communication devices 14 and 24, the lower the radiation noise. In this manner, by interposing the induction element 18a in the reference potential line 1c, it is possible to prevent malfunction of the first PLC communication device 14 and reduce radiation noise.

  Furthermore, it is possible to more effectively prevent the inductive element 18b, the coupling capacitor 17 and the coupling transformer 16 from coming into contact with the internal structure of the vehicle 1 and being damaged by the vibration or vibration of the vehicle 1.

(Embodiment 2)
FIG. 3 is a circuit block diagram illustrating a configuration example of a communication system according to the second embodiment. Since the communication system according to the second embodiment is different from the first embodiment only in the wiring configuration of the reference potential line 1c and the inductive element 18a, the difference will be mainly described below.

  One end of the reference potential line 1 c arranged in the vehicle 201 is connected to the connector 211, and the other end is connected to the first PLC communication device 214. A branch line branched in the middle of the reference potential line 1c of the second embodiment is connected to the reference potential. That is, the reference potential line 1c according to the first embodiment is connected to the reference potential via the charging device 12, but the reference potential line 1c according to the second embodiment is connected to the reference potential without passing through the charging device 12. Has been. An inductive element 18a is interposed in the branch line branched from the reference potential line 1c.

  As in the first embodiment, the communication system according to the second embodiment is converted from the common mode to the differential mode to reduce noise input to the first PLC communication device 214 and prevent malfunction of the first PLC communication device 214. Can do. In particular, in the second embodiment, since the reference potential line 1c arranged in the vehicle 201 is short, the possibility that noise is generated in the reference potential lines 1c and 3c and the control lines 1d and 3d can be reduced. It is possible to more effectively prevent malfunction of the first PLC communication device 214 due to noise.

(Embodiment 3)
FIG. 4 is a circuit block diagram illustrating a configuration example of a communication system according to the third embodiment. The communication system according to the third embodiment is different from the first embodiment only in the wiring configuration of the reference potential line 1c and the inductive element 18a and the configuration of the connector 311. Therefore, the differences will be mainly described below.

  One end of the reference potential line 1 c arranged in the vehicle 301 is connected to the connector 311, and the other end is connected to the first PLC communication device 314. The connector 311 includes a second reference potential line 1e branched from the reference potential line 1c inside the connector 311. An inductive element 18a is interposed in the middle of the second reference potential line 1e. The distal end portion of the second reference potential line 1e is routed from the connector 311 into the vehicle 301 and connected to the reference potential.

  FIG. 5 is a schematic diagram illustrating a configuration of a connector 311 according to the third embodiment. The connector 311 includes a housing 11a that houses a connection portion connected to the two power supply lines 1a and 1b, the control line 1d, and the reference potential lines 1c and 1e arranged in the vehicle. In FIG. 5, for convenience of drawing, the two power supply lines 1 a and 1 b and the connection parts connected to the power supply lines 1 a and 1 b are not shown. The container 11a has an attachment portion 11b attached to the vehicle 301. The attachment portion 11b has a substantially rectangular plate shape. Attachment holes are formed at the four corners of the attachment part 11b, respectively, so that the container 11a can be attached to a predetermined position of the vehicle 301 with a screw or the like. A cylindrical tube portion 11 c projects from the center of one surface of the attachment portion 11 b to the inside of the vehicle 301. The other surface of the attachment portion 11b is provided with a plug connection portion that has a cylindrical shape larger in diameter than the cylindrical portion 11c and into which the plug of the charging gun 30 is inserted and connected during charging. The plug connection portion is provided with a lid that can be opened and closed so as to close the opening.

  11 d of circuit boards are accommodated in the inside of the accommodating body 11a and the cylinder part 11c. An end portion of a connection portion connected to the reference potential line 3c is fixed to the circuit board 11d. One end portion of the reference potential line 1c is connected to the end portion of the connection portion on the circuit board 11d. Further, the induction element 18a interposed in the second reference potential line 1e branched at one end of the reference potential line 1c is held on the circuit board 11d. In addition, a detection circuit 11e that detects connection of the charging gun 30 by a connection detection line is also provided on the circuit board 11d. The induction element 18a, the detection circuit 11e, and other various circuits are covered with a resin cover 11f. Specifically, the circuit board 11d is resin-molded. The cover 11f is held inside the housing 11a so as not to vibrate.

  According to the communication system and the connector 311 according to the third embodiment, the circuit board 11d on which the inductive element 18a is disposed is covered with the resin cover 11f and is held inside the container 11a. Therefore, it is possible to prevent the induction element 18a from coming into contact with the internal structure of the vehicle 301 and being damaged by the vibration or vibration of the vehicle 301. Moreover, there exists an effect similar to Embodiment 1 and 2.

(Embodiment 4)
FIG. 6 is a circuit block diagram illustrating a configuration example of a communication system according to the fourth embodiment. The communication system according to the fourth embodiment is different from the second embodiment in that the third inductive element 19 is provided in the first charge control device 13, and thus the difference will be mainly described below. The configuration of the connector 411 is the same as that of the connector 311 of the third embodiment.

  The first charging control device 13 mounted on the vehicle 401 according to the fourth embodiment is connected to the reference potential via the third inductive element 19. That is, the third inductive element 19 is interposed in the wiring connecting the low potential side terminals of the capacitor C2 and the resistor R1 and the reference potential. Similarly to the inductive elements 18a and 18b, the third inductive element 19 has an impedance with respect to high frequency noise higher than that of the control pilot signal.

  According to the communication system according to the fourth embodiment, regarding noise in the same frequency band as that of the differential signal, the first and second PLC communication devices 414 and 24 connected to the control lines 1d and 3d and the reference potential lines 1c and 3c. The degree of balance is higher than that of a device that does not include the third inductive element 19. Therefore, the noise that is converted from the common mode to the differential mode and input to the first PLC communication device 414 can be more effectively reduced, and malfunction of the first PLC communication device 414 can be prevented.

(Embodiment 5)
FIG. 7 is a circuit block diagram illustrating a configuration example of a communication system according to the fifth embodiment. Since the configuration of the first PLC communication device 514 and the connector 511 is different from that of the first embodiment in the communication system according to the fifth embodiment, the differences will be mainly described below.

  A connector 511 provided in a vehicle 501 according to the fifth embodiment includes a coupling capacitor 17 and a coupling transformer 16 therein. That is, in the first embodiment, the connector 511 includes the coupling capacitor 17 and the coupling transformer 16 included in the first PLC communication device 514. The first PLC communication device 514 includes a communication circuit 15, a power supply circuit 15a, and a second induction element 18b connected to the coupling transformer 16 of the connector 511. As in the third embodiment, the coupling capacitor 17 and the coupling transformer 16 are arranged on a circuit board, and the circuit board is covered with a resin cover.

  Specifically, two branch lines branched from the control line 1 d and the reference potential line 1 c are connected to the coupling transformer 16 via the coupling capacitor 17. The coupling capacitor 17 has a high impedance for the control pilot signal and a low impedance for the differential signal. The coupling transformer 16 includes a primary coil 16a and a secondary coil 16b magnetically coupled to the primary coil 16a. The two branch lines are connected to both ends of the primary coil 16 a via a coupling capacitor 17. One end of two wires is connected to both ends of the secondary coil 16b, and the other end of the two wires is connected to the communication circuit 15 of the first PLC communication device 14.

  The communication system according to the fifth embodiment has the same effects as those of the first embodiment.

(Embodiment 6)
FIG. 8 is a circuit block diagram illustrating a configuration example of a communication system according to the sixth embodiment. Since the configuration of the first PLC communication device 614 and the connector 611 is different from that of the second embodiment in the communication system according to the sixth embodiment, the differences will be mainly described below.

The connector 611 provided in the vehicle 601 according to the sixth embodiment includes the coupling capacitor 17 and the coupling transformer 16 therein. That is, in the second embodiment, the connector 611 includes the coupling capacitor 17 and the coupling transformer 16 included in the first PLC communication device 614. The first PLC communication device 614 includes a communication circuit 15, a power supply circuit 15a, and a second inductive element 18b connected to the coupling transformer 16 of the connector 611. Since the configurations of the coupling capacitor 17 and the coupling transformer 16 are the same as those in the fifth embodiment, detailed description thereof is omitted.
The communication system according to the sixth embodiment has the same effects as those of the second embodiment.

(Embodiment 7)
FIG. 9 is a circuit block diagram illustrating a configuration example of a communication system according to the seventh embodiment. Since the configuration of the first PLC communication device 714 and the connector 711 is different from that of the third embodiment in the communication system according to the seventh embodiment, such differences will be mainly described below.

A connector 711 provided in a vehicle 701 according to the seventh embodiment includes a coupling capacitor 17 and a coupling transformer 16 therein. That is, in the third embodiment, the connector 711 includes the coupling capacitor 17 and the coupling transformer 16 included in the first PLC communication device 714. The first PLC communication device 714 includes a communication circuit 15, a power supply circuit 15a, and a second inductive element 18b connected to the coupling transformer 16 of the connector 711. The coupling capacitor 17 and the coupling transformer 16 are arranged on the circuit board 11d together with the induction element 18a, and are covered with a resin cover 11f. Since other configurations of the coupling capacitor 17 and the coupling transformer 16 are the same as those in the fifth embodiment, detailed description thereof is omitted.
According to the communication system and the connector 711 according to the seventh embodiment, the same operational effects as those of the first to third embodiments can be obtained. In addition, a coupling capacitor 17 and a coupling core for superimposing and separating differential signals are arranged near the power feeding device 2, and an inductive element 18a is provided in the vicinity of the coupling capacitor 17 and the coupling core. Therefore, the possibility that common mode noise generated in the control lines 1d and 3d and the reference potential lines 1c and 3c is converted into differential mode noise is reduced. Therefore, malfunction of the first PLC communication device 714 due to the differential mode noise can be prevented more effectively.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1, 201, 301, 401, 501, 601, 701, 1001 Vehicle 1a, 1b, 3a, 3b, 1001a, 1001b Feed line 1c, 1e, 3c, 1001c Reference potential line 1d, 3d, 1001d Control line 2 Feeder 3 Charging cable 10 Battery 10a Lead battery 11,311,511,611,711 Connector 11a Housing 11b Mounting portion 11c Tube portion 11d Circuit board 11e Detection circuit 11f Cover 12 Charging device 13 First charging control device (communication device)
13a CP receiver circuit (receiver circuit)
14, 514, 614, 714 First PLC communication device 14a Circuit board 14b Wiring 14c Cover 15 Communication circuit 15a Power supply circuit 16 Coupling transformer 16a Primary coil 16b Secondary coil 17 Coupling capacitor 18a, 18b, 19 Inductive element 20 Power Supply device 23 Second charging control device 23a CP transmission circuit 24 Second PLC communication device 25 Communication circuit 26 Coupling transformer 26a Primary coil 26b Secondary coil 27 Coupling capacitor 30 Charging gun 1031 CP reception circuit 1014 PLC communication device C1, C2 Capacitor R1, R2 Resistance O Transmitter circuit Vd Diode

Claims (6)

A control line for transmitting a control signal for controlling charging of a battery mounted on the vehicle;
A reference potential line connected to a reference potential of the vehicle serving as a reference of the control signal;
A communication device that is connected to each of the control line and the reference potential line, and communicates with an external power supply device by superimposing a differential signal having a frequency higher than that of the control signal on the control signal;
A first inductive element that is provided in the reference potential line and a connection portion of the reference potential, or in the middle of the reference potential line, and that has a higher impedance to noise at a frequency higher than that of the control signal; ,
Wiring for connecting the communication device to another battery;
A second inductive element provided at a connection point of the wiring and the other battery, or in the middle of the wiring, and having a second impedance higher than that of the control signal and higher than that of the control signal. system. The communication device
A circuit board holding the second inductive element;
The communication system according to claim 1, further comprising: a resin cover that covers the circuit board holding the second inductive element. The communication device
A filter that separates the differential signal from the control signal;
A coupling transformer connected to the filter, and
The covering is
The communication system according to claim 2, wherein the filter and the coupling transformer are covered. The communication system according to any one of claims 1 to 3, further comprising a receiving circuit connected to the control line and receiving a control signal transmitted from an external power supply apparatus. The third inductive element is provided in the middle of the wiring connecting the receiving circuit to the reference potential, and has a third inductive element whose impedance to high frequency noise is higher than that of the control signal. Communication system. A control line for transmitting a control signal for controlling charging of a battery mounted on the vehicle, and a reference potential line connected to a reference potential of the vehicle, which is a reference of the control signal, and the control A communication device that communicates with an external power supply device by superimposing a differential signal having a frequency higher than a signal on the control signal,
Wiring for connecting the communication device to another battery;
A communication apparatus comprising: an inductive element provided at a connection point of the wiring and the other battery, or in the middle of the wiring, and having an impedance with respect to noise at a frequency higher than that of the control signal larger than that with respect to the control signal.

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